SMC91C95

Operating Temperature Range ............................................................................... 0 to +70
Storage Temperature Range ...............................................................................-55 to +150
Lead Temperature Range (soldering, 10 seconds) .......................................................... +325
Positive Voltage on any pin, with respect to Ground ..................................................Vcc + 0.3V
Negative Voltage on any pin, with respect to Ground ....................................................... -0.3V
Maximum Vcc ....................................................................................................................... +7V
*Stresses above those listed above could cause permanent damage to the device. This is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied.

The SMC91C95 is a VLSI Ethernet Controller that combines ISA and PCMCIA interfaces, as well as an interface to a companion modem chip set, in one chip. It integrates all the MAC and physical layer functions as well as the packet RAM needed to implement a high performance 10BASE-T (twisted pair) node. For 10BASE5 (thick coax), 10BASE2 (thin coax), and 10BASE-F (fiber) implementations, the SMC91C95 interfaces to external transceivers via its AUI port. Only one additional IC is required on most applications.

The SMC91C95 occupies 16 I/O locations and no memory space except for PCMCIA attribute memory space. The same I/O space is used for both ISA and PCMCIA operations. It can directly interface the ISA and PCMCIA buses and deliver no wait state operation. Its shared memory is sequentially accessed with 40ns access times to any of its registers, including its packet memory. No DMA services are used by the SMC91C95; virtually decoupling network traffic from local or system bus utilization. For packet memory management, it integrates a unique hardware Memory Management Unit (MMU) with enhanced performance and decreased software overhead when compared to ring buffer and linked list architectures.

The SMC91C95 is portable to different CPU and bus platforms due to its flexible bus interface, flat memory structure (no pointers), and its loosely coupled buffered architecture (not sensitive to latency). It interfaces directly with Rockwell International L39/C39 controller-based modems and Lucent Technologies' HSM288xCF modem.